This magazine – a little like an almanac – is from 1917 and includes some advertisements on the back pages, including this one:
Notice the ad on the right side which says:
Don’t buy a fountain pen before you’ve tried it
Rouge et Noir
Security fountain pen
Sales with Guarantee!
According to Claus Holten and Poul Lund’s book “Montblanc in Denmark 1914 – 1992 – The Untold Story”, C. Ferslew & Co was the first Montblanc dealer in Denmark, with the bookstore starting to import Rouge et Noir Safety Fillers as early as 1914.